Water and flameproof paper



. paperiis asbestos fibers.

Patented Nov. I, 1932 THOMAS JENKINS, or nonnrs'rown, rnmtss'z nvnumnssrsivon T01 nonmszeown MAGNESIA & ASBESTOS COMPANY, OF NoRB Is'row-N;PENNSYLVANIA; A oonrorca TION OF PENNSYLVANIA WATER AND. rLmnrnoon; 1mm

i No Drawing. Original application filed November {12,j a30, s 1ia1 no.495 267. Div ded? amiuiis, 7

application filed May 1932. "Serial No. 612,657:

his is a division of my application Serial No. 495,267 filed November12, 1930, for Letters Patent of the United States for unprovement inheat insulating coverings; the paper herein claimed being advantageouslyemployed as the outer casing for such coverings for steam and hot Waterconduits and containers in installations for heating buildings and forother purposes.

The principal ingredient of my improved Ordinarily, paper formed of suchfibers is characterized by a dusty gray appearance due to .the naturalcolor of such fibers and is highly absorbent of moisture which causessuch ordinary pap to be rapidly disintegratedwhen subjected to moistureunless provided with an exterior coating of some other material, aspaint, which coating is almost as costly .as the paper itself because ofsorbent nature of such paper, which necessitates the application of anabnormally large amount of paint per unit of surface to cover it. It isthe purpose and effect of my nvention to produce such a paper which 1snot only substantially fiameproof because of the high percentage of itsasbestos content but 1s substantially waterproof and essentiallydifferent in coloring from the natural asbestos fibers; the naturaldusty colorof the fibers being suppressed and modified by inclusiontherewith of a metallic oxide capable of chemical reaction andcombination with the other ingredients of the paper to permanentlyimpart to the paper a pleasing and in eradical color withoutmaterialincrease of the cost of production of such improved paper as comparedwith the ordinary asbestos paper. For instance, I find it convenient tomake'the paper composition ofcertain ingredients which, in the drystate, are in the following proportions:

' 7 Per cent Asbestos fibers 93- Wood cellulose. 3 Starch 2 Iron oxide 2Sodium silicate .50 Alum I .25

the naturally porous and ab- Thedry; materials aforesaid are mixed"about three'times; their bulk" of'water to form 'apulp which-isthenf'ormed into sheets,- conveniently. by ordinary. pa er making means.When such sheets are d'ried,the' me tallicioxide combines'with the other1ngre clients to f'o'rma" moisture"- resistant' binder for-the asbestosfibers and. impart: a periria n'ent pleasingpink tint? to thecomposition throughout theentire thickness ofthe' sheets,

so' that they retaintheir" distinctive coloring without any superficialcoating and despite subjection to such' wear as would removetlieordinary painted coating; 1

Although thecomposition: aforesaid is selfcol'ore'd withz a pleasingefiect, it is adapted to "receiveany desired coating on decoratingmateriali For instance; ,liquid' coating ma;

ter'ial-may be" sprayed thereon orfotherw-ise applied-thereto atmuchless cost'than such coatings may be appliedto ordinary asbestos I paper,because the binder 1 aforesaid has 'ren dered y i'mpr'oved: papernon-absorbent so that may be coveredhv am'inimuni amount of anyordinarypai'nt'. v

compositionnot only. because oftheir: afi'inity forthe silicatethereinwliich cause them to react andcombi'n'e" therewith to form aninsoluble binder for the asbestos fibers, but be- 2 cause any desiredcolor of the composition may be attained by the use thereof. Although Iprefer to use the iron oxide (peroxide) which will produce the pleasingpinktint abovecontemplated for casings for pipe coverings, because thattint harmonizes with any color scheme; other shades and tints from blackto pale yellow may be produced by the employment of iron oxide. However,other metalli c' oxides may be employed to react with the s1l1cate andalum constituents'of the composition to form binders having the desiredwaterproof quality. Therefore, I do not, desire to limit myself to theprecise details of construction, arrangev ment, or method of procedureherein set forth,

as it is obvious that various modifications may be made therein'withoutdeparting from the essential features of my invention, as defined in theappended claims.

Iclaim:

1. A pink tinted water and flalneproof paper including asbestos fibersninety-three per cent.; wood cellulose three per cent; starch two percent. iron oxide two per cent;

sodium silicate one-half of one per cent; and

alum one-fourth of one per cent.

2. A Water and fiameproof paper including asbestos fibers; woodcellulose; starch; iron oxide; sodium silicate; and alum..

3. A water and flameproof paper of which the principal ingredient isasbestos fibers; said fibers being held together by a binder includingthe insoluble residue of the reaction of iron oxide and sodium silicate.

4. A water and fiaineproof paper of which the principal ingredient isasbestos fibers; said fibers being held together by a binder includingthe insoluble residue of the reaction of a metallic oxide with sodiumsilicate.

5. A water and fiameproof paper ofwhich the principal ingredient isasbestos fibers; said fibers being held together by a binder includingthe insoluble residue of the reaction of an oxide with a silicate andalum.

6. A water and fiarneproof paper of which the prlncipal ingredient isasbestos fibers;

said fibers being held together by abinder including the insolubleresidue of the reaction of a metallic oxide with a silicate.

7. A water and flaineproof paper, the principal ingredient of which isasbestos fibers; said fibers being held together by a binder includingthe insoluble residue of the reaction of iron oxide and a derivative ofsodium.

8. A water and flameproof paper, the principal ingredient of which isasbestos fibers; said fibers being held together by a binder includingthe residue of the reaction of an oxide and a silicate of differentmetals.

In testimony whereof, I have hereunto signed my name at Norristown,Pennsylvania, this tenth day of May, 1932.

THOMAS JENKINS.

